Remote control system



Oct. 14, 1941.

W. KOENIG REMOTE CONTROL SYSTEM Filed July 21, 1959 Patented Oct. 14, 1941 'UNITED STATES PATENT OFF REMOTE CONTROL SYSTEM Werner Koenig, .Lucerne, Switzerland, assignor to Landis & Gyr, A.-G., Zug, Switzerland, a body corporate of Switzerland Application July 21, 1939, Serial No. 285;679

In-Switzerland July 21, 1938 1 Claim.

realized and attained by means of the instrunumber of receiving stations is provided. Also, mentalities and combinations pointed out in the an installation made according to these known appended claim. principles is'not protected against the execution The invention consists in the novel parts, conof any specific operation by a series of interferstructions, arrangements, combinations and iming impulses corresponding in its nature and provements herein :shown and described. sequence to the series of impulses of a normal The accompanying drawing, referred to herein switching operation. The known remote control and constituting a ,part hereof, "illustrates one installations are therefore not sufficiently proembodiment of the invention, and together with tected against unintended connections. the description, serve to explain the principles The invention relatesto a remote control inof th i nti 2O stallation operated by the impulse method with The accompanying drawing shows diagrama safety device against unintended connections matically an illustrative embodiment of the produced by interfering impulses. According to present invention as applied to a remote control the invention, the disadvantages inherent in ininstallation with contact selectors driven by syn stallations of a similar kind heretofore known chronous motors, and also 'shows'the circuit conare avoided in that a blocking relay arrangement nections for the embodiment. 7 provided in the transmitter and serving as a The present invention has for its object the safety device, when influenced by interfering improvision of a novel and improved remote conpulses prevents the "execution of the desired optrol installation operating on the impulse method erations in the receivers. The blocking relay for the remote control of switching operations in arrangement, which may comprise a receiving general, such as the switching on or off of street relay and a transmitting relay, of which each lights, hot water storage apparatus and refrigstands in series with a resting contactor of the er'ators, the changing over of multiple tariff other, on being influenced by interfering immeters, the remote indication of the position of pulses, can either block the transmitter by preswitches and many other different types of pventing the transmission of control impulses or eration. The invention has for a further object the provision of a remote control system which is not subject to interference by stray impulses and is particularly adapted for use with the transmission of impulses on overhead lines or other lines adjacent high tension lines.

Attempts to avoid unintended connections caused by the occurrence of interfering impulses -.in the receivers by means of safety methods have previously been made, which seek to prevent the execution of a desired switching operation when interfering impulses occur. Thus arrangements have been suggested, in which the execution of a desired switching operation is either Attempts have also been made to protect remote control installations against the action of interfering impulses by executing .a required switching operation only when the selective impulses together with the succeeding check or control impulses make up a definite number.

All these suggested safety devices, however, considerably increase the cost of the installation, more especially when a comparatively large cause the transmission of a blocking impulse that prevents the receiver from effecting one of the desired operations.

In a remote control installation with synchronously running contact selectors in the transmitter'and in the receivers, the blocking relay arrangement on being influenced by interfering impulses is capable of controlling the contact selector arrangement of the transmitter in such a manner that the transmission of control impulses does not take place. In this case again we may proceed in such a manner that on the occurrence of an interfering impulse 'either the final impulse starting the desired operation in made dependent on the same series of impulses 0 the receivers is not sent out or theblocking 'im'- being received exactly the same twice succes pulse is given shortly before the final impulse sively, if desired, through separate receiving apnormally sent out. In the latter case blocking paratus, or on the determination of the correrelays controlled from the receiving relays of spondence of the transmitted selective impulses the transmitter can be employed. The receivers with the received and return indicated impulses. can be so connected, that the blocking impulse sent out by the transmitter cancels again the preparation for closing the selector current circuit.

It will be understood that the foregoing general description and the following detailed description as well are illustrative and exemplary but are not restrictive of the invention.

The transmitter I, connected to the conductors 2, 4 of the alternating current network l-4 and to the auxiliary conductor 5, comprises a contact selector K with a rotary contact is and selector contacts l-30, a synchronous motor Sy coupled thereto, a starting relay A in the form of a tilting relay with a contactor a; a receiving relay E with a change-over contactor e and an operating contactor 6 a transmitting relay S with a change-over contactor s, a blocking relay Sp in the form of a. tilting relay with contactors si $10 a key contact ta, selector contactors w, W, a zero position contactor n and a restoring contactor r. r

The receiver II; connected to the network conductors I, 4 and to the auxiliary conductor'5 comprises a contact selector K with a rotary contact 10 and selector contacts I3El,.a synchronous motor S11 coupled thereto, a receving relay E with an operating contactor e1 preliminary relays V and V in the form of tilting relays and provided with contactors v and respectively, a terminal relay F likewise made in the form of a tilting relay with a change-over contactor f, a restoring contactor 1' and a Zero position contactor 11 The connection of the individual switch elements of the remote control installation with one another appears directly from the drawing, so that this does not need to be discussed more fully. I

Where an operation is to be efiected in the receiver II, as for example where the change-over contactor f of the terminal relay F is to be changed over from the contact 1 to the contact f, the key contactor i and the selector contactor w must be closed in the transmitter I. In this manner circuits 2, S, t A, I, 4 and 2, 6, t k, e S, 1, 4 are closed, whereby the starting relay A and the transmitting relay S are energized. The starting relay A consequently closes its contactor a, whereby, the synchronous motor S1! is started. By energizing the transmitting relay S the contactor s is changed over, so that the auxiliary conductor is switched off from the receiving relay E and is connected to the conductor 6. A controlling impulse is then sent through 2, 6, s,

5, E 9, 4 to the receiver 11, which causes the receiving relay E to respond. The contactor e1 is then connected to the conductor 8 and thereby the synchronous motor SM is set in operation by the closing of the circuit I 8, 61 k, SM, 9, 4. Upon the setting in operation of the motors SJ and Sy the contactors n and n are respectively closed.

Since the two rotary contacts k, 70 run synchronously and the selector contactor w" is closed, as soon as the two rotary contacts is, k arrive on the selector contact II, the transmitting relay S is energized in the transmitter I through 2, 6, 20 I1, is, e S, I, 4, whereby a controlling impulse in the receiver II, sent through 2, 6, s, 5, E 9, 4 energizes the receiving relay E which connects its operating contactor 61 to the conductor 8. The left-hand'winding of the preliminary relay V is then energized by reason of the now closed circuit I, 8, 61 R I1, 0 9, 4, whereby the contact 11 is closed. Finally the two contact arms k, k of the contact selectors K, K will arrive on the selector contacts 3|]. The transmitting relay S is then energized through 2, 6, 82 30, k, 6 S, 1, 4 and Will change over its contactor s, whereby the now energized receiving relay E attracts its operating contactor 1 A circuit I, 8, 61 k, 30, 11 F, 9, 4 is then closed. The result of this is that the righthand winding of the terminal relay F is energized and the change-over contact 1 is switched off from the contact I and connected to the contact f". The operation associated with the contact f" can then take place.

Shortly before reaching the zero positions of the rotary contacts 76, k the restoring contactors r, T are momentarily closed. In the transmitter I the right-hand winding of the starting relay A is then energized and thereby the contactor a switched ofi from the conductor 6, and in the receiver II, by the energization of the right-hand winding of the relay V", the contactor v is again switched off from the right hand winding of the terminal relay F.

On reaching the zero position, the zero position contactors n, n which were closed at the beginning of the rotation of the contacts of the selectors K, K are again interrupted causing the synchronous motors SJ and Sy of the trans mitter and of the receiver to come to rest. All parts thereupon, with the exception of the contactor f of the relay F, take up the position shown in the drawing. The remote controlin'stallation is therewith again ready for the sending out of a fresh switching impulse or series of impulses.

On the occurrence of an interfering impulse in the conductor 5 after the starting of the contact selectors K, K the receiving relay E of the transmitter I and all the receiving relays E of the receivers II are caused to respond. In the transmitter I, by means of the now actuated contactors e 6 the transmitting relay S is switched off from the rotary contact of the contact selector K and the rotary contact is and also the left-hand winding of the blocking relay S are connected to the conductor 6. The contactor sp is then interrupted and the contactor SP2 is closed.

If an interfering impulse occurs exactly at the moment when the rotary contacts is, k are on the selector contacts 18, the interfering impulse influencing the receiver relay E will change over the contactor v of the relay V in the receiver II. Said contactor 0 thus connects in circuit the left-hand winding of the terminal relay F. As soon as the rotarycontacts k, k then reach the selector contact 29, the transmitting relay S is energized through 2,6, $10 29, k, 6 S, I, 4. A blocking impulse is then sent out, which causes the receiving relay E to respond, whereby the right-hand winding of the relay V thereby energized causes the changing-over of the contactor 12 previously connected to the terminal relay F by the interferingimpulse. Furthermore, in this case the final impulse cannot be sent out, since when the rotary contact it arrives on the selector contact 38 of the contact selector K, the circuit is not closed, the contactor sp being now open.

Shortly before reaching the zero position of the rotary contacts Ic, k of the contact selectors K, K the restoring contactors r, r are momentarily closed. 'The closing of the restoring contactor r in the transmitter I then energizes the right-hand winding of the starting relay A and of the blocking relay Sp. The contactors a and .910 are then again opened and the contactor sp closed. In the receiver II, on the other hand, the momentarily closed restoring contactor 1 will energize only the right hand windings of the preliminary relays V V since these were already previously energized by reason of the arrival of the blocking impulse, the contactor v of the relay V having then been changed over again. At the zero position of the rotary contacts k, k the zero position contaotors n, n are again interrupted. The synchronous motors Si l, Sy consequently come to rest. All the switches of the transmitter and of the receiver then resume again their previous position.

When the contaotors K, K are at rest and an interfering impulse occurs, the receiver II is started as with a normal starting impulse. The transmitter I is thereby also started since the receiving relay E energized by the interfering impulse actuates its contaotors e 6 whereby the starting relay A and therewith the synchronous motor Sy, and furthermore also the blocking relay Sp are energized. What happens then is exactly'the same as in the case just explained. As soon as the rotary contacts is, k arrive on their selector contacts 29, a blocking impulse is sent out, which causes the operation already set forth to be carried out in the receivers. An operation can consequently not be made effective. I

The blocking relay arrangement thus prohibits the execution of an operation by means of any interfering impulses that may occur, and moreover it is quite immaterial whether the interfering impulses occur with the contact selectors at rest or when they are rotating already, and whether an interfering impulse corresponds with one of the controlling impulses in number and sequence. It has thus for the first time been made possible to render remote control installations nearly independent of foreign or disturbing influences in a most advantageous manner, without the costly expenditure which was necessary for the safety arrangements heretofore known.

The blocking relay arrangement is not only, as shown in the drawing, designed in combination with a remote control installation operated by the synchronous selector method, but itis obviously applicable also to other remote control installations. The blocking of the transmitter and of the receivers, on the occurrence of interfering impulses, can also take place in other ways than those indicated. Thus for example it is possible to employ, instead of the receiving relay itself, separate blocking relays for blocking the receivers.

The invention in its broader aspects is not limited to the specific mechanisms shown and. described but departures may be made therefrom within the scope of the accompanying claim without departing from the principles of the invention and without sacrificing its chief advantages.

What I claim is:

In a synchronous selector system, the combination of a transmission line, synchronously operating transmitting selector and receiving selector associated with said line, means at the transmitting selector for transmitting in different selected positions thereof current impulses over the line, means at the receiving selector responsive to one received impulse for preparing a selected circuit for energization, and to another impulse for completing the selected circuit and means for preventing the completion of a circuit in response to interfering impulses in the transmission line not the result of the operation of the transmitting means comprising a relay at the transmitting selector normally connected to the line to be operated by impulses thereover, means operated by the transmitting means for rendering the relay non-responsive to line impulses while the transmittingmeans operates to transmit impulses over the line and means operated by said relay when operated by an interfering impulse for transmitting an impulse causing the nullifying of the preparation of the circuit, if prepared, and for preventing the transmission of the impulse causing the completion of the circuit.

WERNER KOENIG. 

